Re: [PATCH v1 07/18] vfio/ccw: Flatten MDEV device (un)register

[Matthew Rosato <mjrosato@xxxxxxxxxxxxx>]

On 6/2/22 1:19 PM, Eric Farman wrote:
> The vfio_ccw_mdev_(un)reg routines are merely vfio-ccw routines that
> pass control to mdev_(un)register_device. Since there's only one
> caller of each, let's just call the mdev routines directly.

I'd reword slightly to reference the ops extern

".. caller of each, externalize vfio_ccw_mdev_ops and call..."

regardless,

Reviewed-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>

> Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Signed-off-by: Eric Farman <farman@xxxxxxxxxxxxx>
> ---
>   drivers/s390/cio/vfio_ccw_drv.c     |  4 ++--
>   drivers/s390/cio/vfio_ccw_ops.c     | 12 +-----------
>   drivers/s390/cio/vfio_ccw_private.h |  4 +---
>   3 files changed, 4 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
> index 9d817aa2f1c4..3784eb4cda85 100644
> --- a/drivers/s390/cio/vfio_ccw_drv.c
> +++ b/drivers/s390/cio/vfio_ccw_drv.c
> @@ -239,7 +239,7 @@ static int vfio_ccw_sch_probe(struct subchannel *sch)
>   
>   	private->state = VFIO_CCW_STATE_STANDBY;
>   
> -	ret = vfio_ccw_mdev_reg(sch);
> +	ret = mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
>   	if (ret)
>   		goto out_disable;
>   
> @@ -261,7 +261,7 @@ static void vfio_ccw_sch_remove(struct subchannel *sch)
>   	struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
>   
>   	vfio_ccw_sch_quiesce(sch);
> -	vfio_ccw_mdev_unreg(sch);
> +	mdev_unregister_device(&sch->dev);
>   
>   	dev_set_drvdata(&sch->dev, NULL);
>   
> diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
> index 4a64c176facb..497e1b7ffd61 100644
> --- a/drivers/s390/cio/vfio_ccw_ops.c
> +++ b/drivers/s390/cio/vfio_ccw_ops.c
> @@ -656,18 +656,8 @@ struct mdev_driver vfio_ccw_mdev_driver = {
>   	.remove = vfio_ccw_mdev_remove,
>   };
>   
> -static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
> +const struct mdev_parent_ops vfio_ccw_mdev_ops = {
>   	.owner			= THIS_MODULE,
>   	.device_driver		= &vfio_ccw_mdev_driver,
>   	.supported_type_groups  = mdev_type_groups,
>   };
> -
> -int vfio_ccw_mdev_reg(struct subchannel *sch)
> -{
> -	return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
> -}
> -
> -void vfio_ccw_mdev_unreg(struct subchannel *sch)
> -{
> -	mdev_unregister_device(&sch->dev);
> -}
> diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h
> index 5c128eec596b..2e0744ac6492 100644
> --- a/drivers/s390/cio/vfio_ccw_private.h
> +++ b/drivers/s390/cio/vfio_ccw_private.h
> @@ -117,12 +117,10 @@ struct vfio_ccw_private {
>   	struct work_struct	crw_work;
>   } __aligned(8);
>   
> -extern int vfio_ccw_mdev_reg(struct subchannel *sch);
> -extern void vfio_ccw_mdev_unreg(struct subchannel *sch);
> -
>   extern int vfio_ccw_sch_quiesce(struct subchannel *sch);
>   
>   extern struct mdev_driver vfio_ccw_mdev_driver;
> +extern const struct mdev_parent_ops vfio_ccw_mdev_ops;
>   
>   /*
>    * States of the device statemachine.